Developed server-side pagination for the Rule Groups API in the prometheus/prometheus repository, enabling scalable and efficient retrieval of rule groups from large datasets. The work introduced group_limit and next_token parameters to the list rules API, allowing users to navigate extensive rule group collections without overloading the server or client. This feature addressed performance and scalability requirements, improving user experience when handling bulk queries. The implementation involved end-to-end API design, backend integration, and preparation for versioned release. Leveraging Go for backend and API development, the contribution demonstrated a focused approach to enhancing API usability and maintainability within a production environment.